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| 2. |
- Fahnestock, Jesse, 1974-, et al.
(författare)
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RISEnergy: Roadmaps for energy innovation in Sweden through 2030
- 2016
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- RISE Research Institutes of Sweden is a group of research and technology organisations. RISE is a leading innovation partner working global cooperation with academia, enterprise and society to create value, growth and competitiveness through research excellence and innovation.In the area of Energy, RISE has developed innovation Roadmaps covering:Energy Efficient TransportElectric Power SystemEnergy Efficient and Smart BuildingsSustainable Thermal ProcessesEfficient Energy Use in IndustryDecarbonisation of Basic IndustriesThese Roadmaps describe development pathways for technologies, non-technical elements (market design, user behaviours, policies, etc.) and key actors that deliver on a plausible, desirable vision for each respective innovation area in 2030. These Roadmaps are intended to support RISE’s strategic planning and development, but should be relevant reading for anyone interested in energy innovation in Sweden.
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| 3. |
- Hillberg, Emil, et al.
(författare)
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Flexibility needs in the future power system
- 2019
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Power system flexibility relates to the ability of the power system to manage changes. Solutions providing advances in flexibility are of utmost importance for the future power system. Development and deployment of innovative technologies, communication and monitoring possibilities, as well as increased interaction and information exchange, are enablers to provide holistic flexibility solutions. Furthermore, development of new methods for market design and analysis, as well as methods and procedures related to system planning and operation, will be required to utilise available flexibility to provide most value to society. However, flexibility is not a unified term and is lacking a commonly accepted definition. Several definitions of flexibility have been suggested, some of which restrict the definition of flexibility to relate to changes in supply and demand while others do not put this limitation. The flexibility term is used as an umbrella covering various needs and aspects in the power system. This situation makes it highly complex to discuss flexibility in the power system and craves for differentiation to enhance clarity. In this report, the solution has been to differentiate the flexibility term on needs, and to categorise flexibility needs in four categories: Flexibility for Power: - Need Description: Short term equilibrium between power supply and power demand, a system wide requirement for maintaining the frequency stability. - Main Rationale: Increased amount of intermittent, weather dependent, power supply in the generation mix. - Activation Timescale: Fractions of a second up to an hour. Flexibility for Energy: - Need Description: Medium to long term equilibrium between energy supply and energy demand, a system wide requirement for demand scenarios over time. - Main Rationale: Decreased amount of fuel storage-based energy supply in the generation mix. - Activation Timescale: Hours to several years. Flexibility for Transfer Capacity: - Need Description: Short to medium term ability to transfer power between supply and demand, where local or regional limitations may cause bottlenecks resulting in congestion costs. - Main Rationale: Increased utilisation levels, with increased peak demands and increased peak supply. - Activation Timescale: Minutes to several hours. Flexibility for Voltage: - Need Description: Short term ability to keep the bus voltages within predefined limits, a local and regional requirement. - Main Rationale: Increased amount of distributed power generation in the distribution systems, resulting in bi-directional power flows and increased variance of operating scenarios. - Activation Timescale: Seconds to tens of minutes.Here, flexibility needs are considered from over-all system perspectives (stability, frequency and energy supply) and from more local perspectives (transfer capacities, voltage and power quality). With flexibility support considered for both operation and planning of the power system, it is required in a timescale from fractions of a second (e.g. stability and frequency support) to minutes and hours (e.g. thermal loadings and generation dispatch) to months and years (e.g. planning for seasonal adequacy and planning of new investments).
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| 4. |
- Hillberg, Emil, et al.
(författare)
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Flexibility to support the future power systems
- 2019
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Power system flexibility relates to the ability of the power system to manage changes. Solutions providing advances in flexibility are of utmost importance for the future power system. Development and deployment of innovative technologies, communication and monitoring possibilities, as well as increased interaction and information exchange, are enablers to provide holistic flexibility solutions. Furthermore, development of new methods for market design and analysis, as well as methods and procedures related to system planning and operation, will be required to utilise available flexibility to provide most value to society. However, flexibility is not a unified term and is lacking a commonly accepted definition. The flexibility term is used as an umbrella covering various needs and aspects in the power system. This situation makes it highly complex to discuss flexibility in the power system and craves for differentiation to enhance clarity. In this report, the solution has been to differentiate the flexibility term on needs, and to categorise flexibility needs in four categories: Flexibility for Power, Flexibility for Energy, Flexibility for Transfer Capacity, and Flexibility for Voltage. Here, flexibility needs are considered from over-all system perspectives (stability, frequency and energy supply) and from more local perspectives (transfer capacities, voltage and power quality). With flexibility support considered for both operation and planning of the power system, it is required in a timescale from fractions of a second (e.g. stability and frequency support) to minutes and hours (e.g. thermal loadings and generation dispatch) to months and years (e.g. planning for seasonal adequacy and planning of new investments). The categorisation presented in this report supports an increased understanding of the flexibility needs, to be able to identify and select the most suitable flexibility solutions.
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| 5. |
- Lindgren, Markus, 1975-, et al.
(författare)
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A Method for Balancing Short- and Long-Term Investments : Quality vs. Features
- 2008
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Ingår i: EUROMICRO 2008 - Proceedings of the 34th EUROMICRO Conference on Software Engineering and Advanced Applications, SEAA 2008. - : IEEE Computer Society. - 9780769532769 ; , s. 175-182
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Konferensbidrag (refereegranskat)abstract
- There are a number of conflicting forces between shortand long-term considerations for software release planning in industry. For example, from a business perspective it is usually desired with a short time-to-market. However, from software quality perspective it is usually desired to have a longer time-to-market such that the proper architectural mechanisms can be put in place, which in the long-term reduce development cost and addresses quality aspects. In this paper we outline some of these conflicting forces, with a focus on long-lived systems, and examplify how they impact product quality and time-to-market. In this paper we propose a simple, but useful, extensionof the release planning process that addresses these conflicting forces. The method is inspired from empirical data captured in a multiple case study involving 7 companies.
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| 6. |
- Lindgren, Markus, 1975-, et al.
(författare)
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Importance of Software Architecture during Release Planning
- 2008
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Ingår i: 7th IEEE/IFIP Working Conference on Software Architecture, WICSA 2008. - : IEEE Computer Society. - 9780769530925 ; , s. 253-256
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Konferensbidrag (refereegranskat)abstract
- Release planning is the process of deciding what to include in future release(s) of a product. In this paper we look at how software architects are involved during release planning in industry today, and how architectural issues are considered during this phase.
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| 7. |
- Lindgren, Markus, 1975-, et al.
(författare)
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Key Aspects of Software Release Planning in Industry
- 2008
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Ingår i: Proceedings of the Australian Software Engineering Conference, ASWEC. - : IEEE Computer Society. - 9780769531007 ; , s. 320-329
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Konferensbidrag (refereegranskat)abstract
- Software release planning is the process of deciding what to include in future release(s) of a product. Basically the problem can be seen as a company-wide optimization problem involving many stakeholders where the goal is to maximize utilization of the often limited resources of a company and turn them into business benefit. Saliu and Ruhe have proposed a set of key aspects for release planning methods, of which only a subset have been validated in industry. In this paper we use the Saliu and Ruhe key aspects as a starting point for identifying key aspects of release planning. To do this we have performed a multiple case study involving 7 international industrial companies, all producers of software intensive products. Our contribution is (1) a more strict meaning of a release planning key aspect, (2) validation of some of the aspects proposed by Saliu and Ruhe, and (3) an extension of the key aspects. We also capture state-of-the-practice for release planning in industry.
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| 8. |
- Lindgren, Markus, 1975-
(författare)
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Towards a Capability Model for Release Planning of Software Intensive Systems
- 2008
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Release planning is an early product development activity concerned with deciding which features and quality improvements that should be pursued in product development projects, i.e., it is an activity which in large parts decide how the development budget of a company is allocated. This thesis investigates release planning for long-lived software intensivesystems; systems which contain software, electronics, and mechanics, and which have a life-cycle of 10-20 years. In performing release planning for these kind of systems, the existing system, including its architecture, often represent a large investment which has impact on which features and quality improvements that are cost-efficient to include in a future release. However, in industry today, little attention is given to the existing system during planning, resulting in decisions being based on uncertain information, and thereby increasing the risk of problems in the development projects. This thesis is based on a multiple case study involving seven industrialcompanies developing and producing long-lived software intensive systems. There are several contributions in this thesis, aimed at understanding and improving the release planning process: (1) validation of previous research related to key-aspects for release planning including identification of short- and long-term planning as a new key-aspect; (2) the capture of state-of-the-practice for release planning in industry; (3) a proposal for a capability model for release planning, which can be used to assess the capabilities of a company's release planning process, but also for identifying process improvement possibilities; and (4) a process for how to decide the balance between investments in features and quality improvements, developed based on the practices used at two of the most capable companies in the study. Finding such a balance is important since adding new features may attract new potential customers, while improving the quality for existing customers can reduce costs of poor quality.
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| 9. |
- Lindgren, Markus, 1975-, et al.
(författare)
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Towards a Capability Model for the Software Release Planning Process — Based on a Multiple Industrial Case Study
- 2008
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Ingår i: In Proc. 9th International Conference on Product Focused Software Process Improvement. - Berlin / Heidelberg : Springer. - 9783540695646 ; , s. 117-132
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Konferensbidrag (refereegranskat)abstract
- Software release planning is an important activity for effectively identifying the customer needs generating best business, especially for incremental software development. In this paper we propose a capability model for improving the release planning process of an organization. Using this model it is possible to 1) determine the capabilities of an organization’s release planning process, and 2) identify areas for improvement. The model is based on empirical data from a multiple case study involving 7 industrial companies, all being producers of software intensive systems. We also provide examples of how the proposed capability model can be applied using the companies from the study.
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| 10. |
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